JP2010012393A - Treatment method for organic sludge, treatment method for inorganic sludge, and treatment method for organic and inorganic sludge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method for organic sludge which can efficiently separate all kinds of organic sludge into organic scum and clean water in a short time. <P>SOLUTION: The treatment method for organic sludge comprises an organic sludge preliminary treatment process A for removing large materials and oil from the organic sludge, an organic sludge pretreatment process B for removing fine materials from sludge (a) obtained in the organic sludge preliminary treatment process A by centrifuge and carrying out neutralization, an organic sludge main treatment process C for adding a coagulant to sludge (b) obtained in the organic sludge pretreatment process B and agitating the sludge to coagulate and separate organic matter, and an organic sludge post-treatment process D for carrying out the biological treatment and membrane treatment of sludge c yielded in the organic sludge main treatment process C. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention treats surplus sludge (organic sludge) generated by treating activated sludge from various wastewater generated in sewage treatment facilities, food factories, large stores, hotels, restaurants, factories, etc., and treats inorganic sludge. Regarding the method.

  In sewage treatment, mainly domestic wastewater and human waste, after removing coarse and solid materials from the raw water in the sedimentation tank, aeration (biological) treatment with microorganisms is performed in the biological reaction tank, which is separated from excess sludge in the sedimentation tank. The standard activated sludge method is applied, in which it is separated into water, surplus sludge is landfilled or incinerated, and the separated water is sterilized with chlorine and discharged. The problems with this treatment method are that it requires a vast sedimentation tank and biological treatment tank, that it takes a long time for biological treatment, and that this process generates enormous excess sludge, which can be incinerated or landfilled. It has the problem of causing environmental destruction.

Various techniques have been proposed as treatment methods for suppressing the generation of excess sludge. For example, the raw water is biologically treated in an aeration tank, and it is separated into treated water and sludge in a sedimentation tank, followed by ozone treatment on the sludge to promote BOD componentization (solubilization), and then ozone treatment. Of organic wastewater (organic sludge) that adds flocculant to separated sludge and separates it into separated sludge and separated water (Patent Literature 1) There is a method for treating organic sludge (Patent Document 2) in which a flocculant is added to a sludge and liquid in a sedimentation tank, and the separated sludge is subjected to ozone treatment to be reformed and returned to the aeration tank.
All of these conventional techniques are treatment methods centered on biological treatment, and like the sewage treatment method described above, the sedimentation tank and the biological treatment tank require a large area, and the biological treatment efficiency is low. Therefore, there are problems that it takes a long time for the treatment, and that it is still necessary to treat the excess sludge.

JP 2002-28686 A JP 2008-86848 A

Excess sludge produced by the activated sludge method is a mixture of a wide variety of organic and inorganic pollutants and contains 90% or more of moisture, and without using the same sludge properties as in the prior art. If biological treatment is performed, the surplus sludge to be treated is not in a state suitable for treatment with microorganisms, so the treatment efficiency becomes low and enormous treatment time is required. In the worst case, microorganisms die and biological treatment is not possible. An impossible situation occurs. Further, in the prior art, the surplus sludge that has been biologically treated is described up to the step of being transferred to a sedimentation tank and separated into solid and liquid, but how to treat organic scum and separated water as solids Not clear.
One object of the present invention is to provide a method for treating organic sludge and / or inorganic sludge capable of treating all kinds of sludge efficiently and in a short time.
Another object of the present invention is to provide a method for treating organic sludge and / or inorganic wastewater that treats all types of sludge efficiently and in a reusable manner.
Other objects of the present invention will become clear from the description of the embodiments.

The organic sludge treatment method of the present invention is characterized by a fine solid from sludge treated in the organic sludge pretreatment step, the organic sludge pretreatment step of removing solids and / or oil from the organic sludge. Organic sludge pretreatment process that centrifuges and neutralizes if necessary, organic system that coagulates and separates organic matter contained in sludge by adding a flocculant to sludge treated in the organic sludge pretreatment process It is in the point provided with the organic sludge post-treatment process which carries out biological treatment and membrane treatment of the sludge treated in the sludge main treatment process and the organic sludge main treatment process. Organic sludge Obtained by centrifugation by returning at least part of the organic scum coagulated and separated in the main treatment process to the sludge pretreatment process and mixing it with the sludge treated in the organic sludge pretreatment process. Organic scum with a low moisture content is increased, thereby saving time and energy for burning or regenerating the organic scum. In addition, if the sludge treated in the organic sludge pretreatment process is stored in a large storage tank, various organic sludges transported from the outside by a tank truck will be mixed and always have stable properties. Subsequent processing steps can be performed stably and with high efficiency.

The feature of the method for treating inorganic sludge of the present invention is that an inorganic sludge pretreatment step for removing sand from the inorganic sludge, a fine solid is centrifuged from the sludge treated in the inorganic sludge pretreatment step. Inorganic sludge pretreatment process, treated in inorganic sludge main treatment process, inorganic sludge main treatment process, adding flocculant to sludge treated in inorganic sludge pretreatment process to coagulate and separate inorganic substances contained in sludge It is in the point provided with the inorganic system sludge post-treatment process which carries out biological treatment and membrane treatment of the sewed sludge.

The organic and inorganic sludge treatment method of the present invention is characterized by an organic sludge pretreatment step for removing solids and / or oil from the organic sludge, and a sludge treated in the organic sludge pretreatment step. Fine solids are centrifuged and neutralized as necessary. Organic fludge pretreatment process. Addition of flocculant to sludge treated in organic sludge pretreatment process to coagulate and separate organic substances contained in sludge. Organic sludge main treatment step, inorganic sludge pretreatment step to remove sand from inorganic sludge, inorganic sludge pretreatment step to centrifuge fine solids from sludge treated in inorganic sludge pretreatment step, The sludge treated in the inorganic sludge pretreatment process was added in the sludge main treatment process, the organic sludge main treatment process, and the inorganic sludge main treatment process to add the flocculant to the sludge treated in the inorganic sludge pretreatment process. Biological sludge And in that it comprises a post-treatment step of membrane treatment.

  According to the organic sludge treatment method of the present invention, solids and oil were removed from the organic sludge, and further, the flocculant was added to the organic sludge and stirred to agglomerate and separate the organic matter contained in the sludge. Biological treatment of sludge makes the properties of sludge to be biologically treated substantially uniform, greatly reducing the burden of biological treatment, and allowing organic sludge to be discharged efficiently into sewage and rivers in a relatively short period of time or within the office It can be made into purified water that can be used as medium water.

  According to the method for treating inorganic sludge of the present invention, sand is removed from inorganic sludge, and further, a flocculant is added to and stirred in the inorganic sludge to coagulate and separate inorganic substances contained in the sludge and organic substances that are mixed somewhat. Since the sludge obtained in this way is biologically treated, the properties of the sludge to be biologically treated become substantially uniform, the burden of biological treatment is greatly reduced, and inorganic sludge can be discharged efficiently into sewage and rivers in a relatively short period of time. It can be made into purified water that can be used as medium water in the office.

  According to the organic and inorganic sludge treatment method of the present invention, since the organic sludge post-treatment step and the inorganic sludge post-treatment step are collectively treated, the organic sludge post-treatment step and There is an effect that the equipment, equipment and installation area can be halved as compared with the case where the post-treatment process of inorganic sludge is provided separately.

The best embodiment of the present invention comprises an organic sludge treatment flow and an inorganic sludge treatment flow,
This is a processing method that shares the post-processing steps of each processing flow. The treatment plant to which the organic sludge treatment method and the inorganic sludge treatment method provided by the present invention are applied is constructed as a public facility, and it is necessary to treat the organic sludge and inorganic sludge generated in the area. . For this reason, organic sludge and inorganic fixed sludge can be treated in a short time and with high efficiency in a treatment plant constructed in one place, and each post-treatment process can be shared, so the treatment plant is downsized and the installation area is reduced. Can be achieved.

  FIG. 1 is a process diagram showing an embodiment of a method for treating organic sludge according to the present invention. In the figure, A accepts organic sludge (raw water), removes coarse substances contained therein, and further removes oil. The treatment step B is a pretreatment step in which fine solids are centrifuged from the sludge a treated in the pretreatment step A, and neutralization is performed in order to efficiently carry out the treatment in the subsequent step, and C is a pretreatment. The main treatment step of aggregating and separating the organic matter contained in the sludge b by adding and stirring the flocculant to the sludge b treated in the step B, and D is the biological treatment and membrane treatment of the sludge c treated in the main treatment step C This is a post-treatment step for obtaining treated water d that can be discharged into a river or used as the middle water in the office.

The processing steps A, B, C and D shown in FIG. 1 will be described in detail using the organic sludge treatment apparatus shown in FIG. 2 and the post-treatment apparatus shown in FIG.
In FIG. 2, a1 is an input path for receiving the organic sludge carried by the tank truck, a2 is a storage section provided at the end of the input path, and a3 is an organic system provided between the input path a1 and the storage section a2. For example, a few mm mesh sieve coarse remover for removing coarse material from sludge, a4 is an oil removal water tank for removing oil from organic sludge, a41 is an oil removal water tank a4 except for the oil removal water tank a4 near the bottom. A partition wall p1 that partitions in a direction perpendicular to the flow direction of the organic sludge, p1 is a pipe that sends the organic sludge from the storage part a2 to the oil removal water tank a4, and the pump is not shown. Oil contained in the organic sludge sent from the storage part a2 to the oil removal water tank a4 is present on the water surface and can be easily removed with a scrubber. The reason why the oil removal water tank a4 is partitioned into a plurality of regions by the partition wall a41 on the water surface is to ensure the removal of oil. The pretreatment step A is a step of removing coarse substances and oil, and includes a sieve coarser a3 and an oil removal water tank a4. The organic sludge often contains oil, but when organic sludge that does not contain oil is carried in, the sludge is removed even if the scrubber operates when passing through the oil removal water tank a4. Is not applicable.

  In FIG. 2, b1 is a water quality stabilization tank that stores sludge a that has overflowed the oil removal water tank a4. This tank has a relatively large capacity and mixes various organic sludges that are carried from outside with a tank truck. As a result, the sludge having a stable property (water quality) is used to perform the subsequent processing step with high efficiency. b2 is a dehydration adjustment tank that stores sludge a that overflows the water quality stabilization tank b1, b3 is a centrifuge disposed on the dehydration adjustment tank b2, b4 is a neutralization processor disposed on the dehydration adjustment tank b2, and p2 Is a pipe for sending the treated water a to the centrifuge b3 from near the bottom of the dehydration adjustment tank b2, and p3 is an organic scum centrifuged by the centrifuge b3 (normally scum is a floating contaminant, A pipe that sends a sludge from which fine solids are centrifuged by a centrifuge b3 to a neutralizer b4. The pipe p5 is a pipe that sends the sludge b neutralized by the neutralizer b4 to the next process. The neutralization processor b4 is, for example, one that adds caustic soda or dilute sulfuric acid to obtain sludge b having a pH of around 7, and plays a role in increasing the efficiency of subsequent processing. The pretreatment process B is a process of subjecting sludge to centrifugal separation and neutralization, and is realized by the centrifugal separator b3 and the neutralizer b4. The neutralization treatment is intended to adjust the pH of the centrifuged sludge to a value suitable for the next treatment step, and if the pH of the centrifuged sludge is a predetermined value, the neutralization treatment is performed. It is unnecessary. The centrifuge b3 can rotate at a high speed of 3600 to 6000 rpm, functions to centrifuge fine solids mixed in the sludge a and dissolved organic matter, and plays a role of obtaining organic scum having a low water content. Plays. Organic scum having a low water content has the advantage that energy saving and short-time treatment can be realized when incineration processing and when processing for reuse.

  In FIG. 2, c1 is a coagulation treatment adjustment tank that primarily stores sludge b neutralized by the neutralization processor b4 and sent from the pipe p5, and c2 uses a coagulant disposed on the coagulation treatment adjustment tank c1. P6 is a pipe that sends the sludge b from the coagulation treatment adjustment tank c1 to the physical water purification device c2, p7 is a pipe that sends the organic scum that is agglomerated and separated by the physical water purification device c2, and p8. Is a pipe that branches from the pipe p7 and returns a part of the organic scum, preferably the whole to the water stabilization tank b1, and p9 sends the sludge c from which the organic scum has been removed by the physical water purification device c2 to the next step. It is a pipe. The physical water purification device c2 adds and agglomerates suitable for agglomeration of the organic matter contained in the sludge b, and agitates the organic matter to form an organic scum. A device for removing organic scum, for example, a physical water purification device “Comet” manufactured by Weirex Rewater Co., Ltd. is preferable. This comet has a model that has the function of neutralizing before administering the flocculant, and has the merit that the sludge pH can be adjusted more accurately to increase the efficiency of coagulation / separation of organic matter. As the flocculant to be used, a flocculant suitable for the sludge b to be treated can be selected from various commercially available flocculants. For example, Electite manufactured by Weylex Rewater Co., Ltd. Is preferred. This processing step C is a step of aggregating and separating organic substances contained in the sludge b by administering a flocculant to the sludge b, and is executed by the physical water purification device c2. However, considering the energy saving and processing time of waste treatment, all of the organic scum coagulated and removed by the physical water purification device c2 is returned to the water quality stabilization tank b1, and the organic scum is removed by the centrifuge b3. It is preferable to reduce the moisture content by separating from the sludge, and it is desirable to include returning to the treatment step C.

  In FIG. 3, d1 is a mixing tank for storing the sludge c sent from the previous processing step through the pipe p9, d2 is a neutralizer disposed on the mixing tank d1, and p10 is a sludge c from the mixing tank d1. Pipe that is sent to the neutralizer d2, p11 is a pipe that is sent to the first aeration tank d3 for biological treatment of the sludge c neutralized by the neutralizer d2, and d4 is sludge that overflows the first aeration tank d3. The second aeration tank for storing c and biological treatment, d5 centrifuges organic scum mainly composed of dead bodies of microorganisms from the biologically treated sludge c stored in the second aeration tank d4 A centrifuge, p12 is a pipe that sends the sludge c from the second aeration tank d4 to the centrifuge d5, and p13 is a pipe that returns the sludge c from which the organic scum is centrifuged from the centrifuge d5 to the second aeration tank d4. , P14 is centrifuge d5 A pipe for sending the centrifuged organic scum to the storage site, d6 is a third aeration tank for biological treatment by storing sludge c overflowing the second aeration tank d4, d7 overflows the third aeration tank d6 A membrane aeration tank for storing sludge c and performing membrane treatment, d71 is a membrane treatment apparatus disposed in the membrane aeration tank d7, d8 is sludge d (membrane treatment apparatus) sent from the membrane aeration tank d7 through a pipe p15 d9 is a reverse osmosis membrane treatment device disposed on the storage tank d8, and p16 is reverse osmosis from the storage tank d8. Pipe that sends sludge d to membrane treatment device d9, d10 is a first discharge adjustment tank that primarily stores sludge d that overflows storage tank d8, and p17 is sludge d stored in first discharge adjustment tank d10 as treated water d. Release to river The pipe d11 primarily stores sludge d sent from the reverse osmosis membrane treatment device d9 through the pipe p18 (which is treated with the reverse osmosis membrane treatment device d9 and is purified water, but is referred to as sludge for convenience of explanation). The second discharge adjustment tank p19 is a pipe that sends the sludge d stored in the second discharge adjustment tank d11 to the office for reuse as treated water d. As the film processing apparatus d71, for example, a submerged film of Kubota Corporation is preferable. In this embodiment, the case where an aerobic microorganism is used as a microorganism used for biological treatment to shorten the biological treatment time is shown. However, the present invention is not limited to this, and the amount of sludge produced is long but the treatment time is long. Less anaerobic microorganisms may be used.

  According to the organic sludge treatment method and treatment apparatus described above, organic matter is coagulated and separated from the organic sludge by a flocculant, and then biological treatment and membrane treatment are performed, so that the organic sludge is efficiently treated in a short treatment time. Can be removed. For this reason, the organic sludge treatment plant as a public facility which processes a lot of organic sludge efficiently can be realized.

  When the organic sludge is treated using the organic sludge treatment apparatus shown in FIG. 2, sludge as raw water carried in a tank truck, sludge after being treated by the physical water purification device C2 “Comet” in this treatment step C c, treated water d discharged into the river after the post-treatment process D, treated water d reused as intermediate water in the office, coarse, SS (floating matter), BOD (biochemical oxygen demand) ), COD (chemical oxygen demand), TN (total nitrogen), and TP (total phosphorus) are as shown in Table 1. The unit of items other than pH is mg / L. The raw water in Table 1 is an example, and is different every time it is brought in.

  When the change of BOD is seen in Table 1, it turns out that BOD which existed, for example in 8000 mg / L in raw water will be 60 mg / L after this process process, and has decreased to 1/130. In the prior art, since BOD is removed by biological treatment, in order to remove 8000 mg / L of BOD, a treatment day of about 2 weeks is required. In the present invention, if, for example, a comet is used in this processing step C, the BOD can be removed in a time of 1 to 2 minutes such that the sludge flows in the apparatus, and the BOD is also 1/130 in the post-processing step. The period can be shortened to 1/130. Therefore, according to the organic sludge treatment method of the present invention, the treatment time can be shortened to 1/50 to 1/100 compared with the prior art (biological treatment), and the occupation area of various tanks used for biological treatment is also 1 There is an effect that can be reduced to / 50 to 1/100.

  FIG. 4 is a process diagram showing an embodiment of the method for treating inorganic sludge of the present invention. In the figure, E is a pretreatment for accepting inorganic sludge (raw water) and removing sand occupying most of the coarse substances contained therein. Step F is a pretreatment step of centrifuging fine solids from the sludge e treated in the pretreatment step E. G is an inorganic system obtained by adding and stirring a flocculant to the sludge f treated in the pretreatment step F. This treatment process for agglomerating / separating scum, D is the treated water d that can be discharged into the river by using biological treatment and membrane treatment of the sludge g treated in this treatment process G, or used as domestic water in the office. Obtain the same post-processing step as shown in FIG.

  The processing steps E, F, G and D shown in FIG. 4 will be described in detail using the inorganic sludge treatment apparatus shown in FIG. 5 and the post-treatment apparatus shown in FIG.

  In FIG. 5, e1 is an input path for receiving inorganic sludge that does not contain the supernatant sand that has been carried by the tank truck, and e2 is an input path that receives inorganic sludge mainly containing sand that has been precipitated while being transported by the tank truck. A storage part provided adjacent to e1, e3 is a sand-water separator provided in the storage part e2, and removes sand from the inorganic sludge, and e4 is sand from the inorganic sludge sent from the input path e1 through the pipe p20. The pretreatment process E is executed by these in the vibration roughing machine except for. p21 is a pipe for sending sand to the storage site, and p22 is a pipe for sending sludge e from which sand has been removed.

  In FIG. 5, f1 is a primary centrifuge tank for storing the sludge e sent from the storage unit e2 through the pipe p23 and the sludge e sent from the vibration roughing machine e4 through the pipe p22, and f2 is a centrifugal separation process. A centrifuge disposed on the primary tank f1, p23 is a pipe for sending the sludge e1 from the centrifuge primary tank f1 to the centrifuge f2, and p24 is a pipe for sending the centrifuged inorganic scum to the place, p25 is a pipe for returning the sludge from which inorganic scum has been removed to the primary tank f1 for centrifugal separation. f3 is a secondary tank for centrifugal treatment for storing sludge overflowing from the primary tank for centrifugation f1, f4 is a centrifugal separator disposed on the secondary tank for centrifugal treatment f3, and p26 is a centrifugal treatment. A pipe for sending sludge from the secondary tank f3 to the centrifuge f4, p27 a pipe for sending the centrifuged inorganic scum to the storage site, and p28 a secondary tank f3 for removing the sludge from which the inorganic scum has been removed It is a pipe to return to. The pretreatment step F is executed by these centrifuges f2 and f4. The centrifuge used here functions satisfactorily at a rotational speed of about 3000 rpm because sludge has less oil.

  In FIG. 5, g1 is a coagulation treatment adjustment tank for temporarily storing sludge f overflowing from the centrifugal separation secondary tank f3, and g2 is a physical water quality using a coagulant disposed on the coagulation treatment adjustment tank g1. The purification device, p29 is a pipe that sends sludge f from the coagulation treatment adjustment tank g1 to the physical water quality purification device g2, p30 is a pipe that sends the inorganic scum coagulated and separated by the physical water quality purification device g2, and P31 is the physical water quality It is a pipe that sends the sludge g from which inorganic scum has been removed by the purification device g2 to the next process. The physical water purification device g2 is a device that agglomerates suitable for agglomeration of inorganic substances to the sludge f and agitates to agglomerate the inorganic substances, and precipitates and filters this to remove inorganic scum from the sludge f. Thus, for example, a physical water purification device “Comet” manufactured by Weirex Rewater Co., Ltd. is preferable. As for the flocculant to be used, a flocculant suitable for the treatment of inorganic sludge (sludge f) can be selected from a variety of commercially available flocculants. ) Made electite is preferred. This treatment process G is executed by the physical water purification device g2. In addition, the sludge f contains not only inorganic pollutants but also organic pollutants, and it is preferable to use a coagulant suitable for agglomeration of organic pollutants and inorganic pollutants.

  The sludge g processed in the main processing step G in FIG. 5 is sent to the mixing tank d1 in FIG. 3 through the pipe p31, and the post-processing step D is executed. The inorganic sludge from which the main treatment step G has been completed has the inorganic sludge removed, and the main treatment step C in FIG. 1 has been completed to become substantially the same sludge as the organic sludge from which the organic pollutants have been removed. Thus, the post-processing apparatus shown in FIG. 3 can be used. Therefore, the inorganic sludge post-treatment process is the same as the organic sludge post-treatment process described above, and thus the description thereof is omitted to avoid duplication.

  According to the inorganic sludge treatment method and treatment apparatus described above, the inorganic sludge is removed by agglomeration and removal of the inorganic matter using a flocculant, and then subjected to biological treatment and membrane treatment, so that the inorganic sludge can be treated with a short treatment time and high time. Can be removed efficiently. For this reason, the inorganic sludge treatment plant as a public facility which processes a lot of inorganic sludge efficiently can be realized.

  When the inorganic sludge is treated using the inorganic sludge treatment apparatus shown in FIG. 5, the inorganic sludge as raw water carried in the tank truck, the sludge treated by the physical water purification device g2 “comet” in this treatment step G g, treated water d discharged into the river after the post-treatment process D, treated water d reused as medium water at the office, coarse, SS (floating matter), BOD (biochemical oxygen demand) ), COD (chemical oxygen demand), TN (total nitrogen), and TP (total phosphorus) are as shown in Table 2. The unit of items other than pH is mg / L.

  When the change of BOD is seen in Table 2, it turns out that BOD which existed, for example in 2000 mg / L with raw | natural water will be 60 mg / L after this process process, and is reducing to 1/30. In order to remove this BOD only by biological treatment, a treatment day of about one week is required. However, in the present invention, for example, if a comet is used in this treatment step C, the amount of sludge flowing in the apparatus is 1-2. The BOD can be removed in minutes, and the post-processing step can also shorten the processing period to 1/30 because the BOD is 1/30. Therefore, according to the method for treating inorganic sludge of the present invention, the treatment time can be shortened to 1/15 to 1/30 compared with the prior art (biological treatment), and the equipment area used for biological treatment is also 1/15 to There is an effect that it can be reduced to 1/30.

  FIG. 6 is a process diagram showing a practical example of the present invention in which organic sludge and inorganic sludge are pre-processed, pre-process and main process are performed separately, and the post-process is performed together. The organic sludge treatment process diagram shown in FIG. 1 and the inorganic sludge treatment process diagram shown in FIG. 4 are combined, and description of each treatment process is omitted. It is possible to combine organic sludge and inorganic sludge from the pre-treatment process to the post-treatment process in a common treatment process, but since the treatment contents are different from the pre-treatment process to the main treatment process, organic matter and In order to reliably remove inorganic substances, it is necessary to increase the number of processing steps, and there is a problem that the processing time increases. In the present invention, when the characteristics of the organic sludge and the inorganic sludge no longer exist from the pretreatment process to the main treatment process, the post-treatment process is made a common treatment process. It can be executed efficiently, and further has the effect of reducing the processing plant installation area and equipment scale. Specifically, as can be seen from Table 1 and Table 2, the reduction ratio of the equipment area achieved by the organic sludge treatment method of the present invention is 1/50 to 1/100 and achieved by the inorganic sludge treatment method of the present invention. The reduction ratio of the facility area to be added is 1/15 to 1/30.

  FIG. 7 is a schematic view showing a thermal decomposition processing apparatus for converting organic scum into carbides by thermal decomposition and reusing them. In the figure, K1 is generated in a drying tube K11 for drying organic scum as an object to be processed in an electric heating furnace, a carbonizing tube K12 for carbonizing dried organic scum, a drying tube K11, and a carbonizing tube K12. A gas treatment tube K13 that passes through and disinfects gas containing dioxin at 900 ° C. or higher is disposed. The electric heating furnace K1 is heated by a plurality of ceramic heaters arranged so as to penetrate the electric heating furnace K1 so that the temperature can be adjusted. K14 is a connecting pipe for supplying an object to be processed from the drying pipe K11 to the carbonization processing pipe K12, and K15 and K16 are gas connections for sending a gas containing dioxin generated in the drying pipe K11 and the carbonizing processing pipe K12 to the gas processing pipe K13. It is a tube. As for K2, the cooling pipe K21 which cools the to-be-processed object carbonized by the cooling part arrange | positioned under the electric heating furnace K1 is arrange | positioned by penetration. K22 is a connecting pipe for sending the workpiece carbonized from the carbonizing pipe K12 to the cooling pipe K21. K17, K18, and K23 are electric motors that are arranged in the drying pipe K11, the carbonization processing pipe K12, and the cooling pipe K21 and drive a screw conveyor (not shown) that conveys the workpiece. K3 is a hopper that receives the organic scum, K4 is a conveying device that conveys and supplies the organic scum received by the hopper K3 to the hopper K111 of the drying tube K11, and K41 is a screw that is disposed in the conveying device K4 and conveys the workpiece. It is an electric motor that drives a conveyor (not shown). The inside of the drying pipe K11 and the carbonization processing pipe K12 is an inert gas atmosphere having a low oxygen concentration so that the object to be processed does not burn. The organic scum removed from the wastewater by the organic wastewater treatment device is regenerated into carbide by being treated by this thermal decomposition treatment device. Therefore, it is not necessary to landfill or incinerate organic scum as in the prior art.

  The organic sludge treatment, inorganic sludge treatment, and organic scum treatment described above are preferably arranged close to each other in the same site. For example, organic sludge treatment equipment and inorganic sludge treatment equipment are placed adjacent to each other so that they can share their post-treatment processes, and organic scum pyrolysis treatment equipment is placed near the organic sludge treatment equipment. . By arranging the organic sludge treatment equipment and the inorganic sludge treatment equipment close to each other, there is an effect that the odors released from the sludge in each treatment step can be collected and subjected to a non-bromide treatment.

  Although the present invention has been described by taking typical examples as examples, the present invention is not limited to these, and various modifications can be made within the scope of the technical idea of the present invention.

It is a block diagram explaining process drawing which shows the Example of the processing method of this invention organic sludge. It is a schematic block diagram which shows the processing apparatus of the organic sludge for performing the processing method of this invention organic sludge. It is a schematic block diagram which shows the post-processing apparatus for performing the post-processing process of the processing method of this invention organic sludge. It is a block diagram explaining process drawing which shows the Example of the processing method of this invention inorganic sludge. It is a schematic block diagram which shows the processing apparatus of the inorganic sludge for performing the processing method of the inorganic sludge of this invention method. It is a block diagram explaining process drawing which shows the Example of the processing method of this invention organic type and inorganic type sludge. It is a schematic block diagram of the thermal decomposition processing apparatus for recycle | reusing the organic scum removed from organic sludge by the processing method of organic sludge of this invention.

Explanation of symbols

A Organic sludge pretreatment process B Organic sludge pretreatment process C Organic sludge main treatment process D Posttreatment process E Inorganic sludge pretreatment process F Inorganic sludge pretreatment process G Inorganic sludge main treatment process a3 Sieve roughing Vessel a4 Oil removal tank b3 Centrifuge b4 Neutralizer
c2 Physical water purification device d2 Neutralization processor d3 First aeration tank d4 Second aeration tank d5 Centrifuge d6 Third aeration tank d71 Membrane treatment device d9 Reverse osmosis membrane treatment device

Claims (5)

  Organic sludge pretreatment process that removes solids and / or oil from organic sludge, fine solids are centrifuged from the sludge treated in the organic sludge pretreatment process, and neutralized as necessary In the organic sludge pretreatment process, in the organic sludge main treatment process, the coagulant is added to the sludge treated in the organic sludge pretreatment process to coagulate and separate organic substances contained in the sludge. An organic sludge treatment method comprising a post-treatment step of organic sludge for biological treatment and membrane treatment of the treated sludge.   Inorganic sludge pretreatment process for removing sand from inorganic sludge, inorganic sludge pretreatment process for centrifuging fine solids from sludge treated in the inorganic sludge pretreatment process, and inorganic sludge pretreatment process An inorganic sludge main treatment step for coagulating and separating inorganic substances contained in the sludge by adding a flocculant to the sludge treated in step 1, and an inorganic sludge for biological treatment and membrane treatment of the sludge treated in the inorganic sludge main treatment step An inorganic sludge treatment method comprising a post-treatment treatment step. Organic sludge pretreatment process that removes solids and / or oils from organic sludge, organic material that centrifuges fine solids from the sludge treated in the organic sludge pretreatment process, and neutralizes as necessary Organic sludge pretreatment step, organic sludge main treatment step of coagulating and separating organic substances contained in the sludge by adding a flocculant to the sludge treated in the organic sludge pretreatment step,
Inorganic sludge pretreatment process for removing sand from inorganic sludge, inorganic sludge pretreatment process for centrifuging fine solids from sludge treated in the inorganic sludge pretreatment process, and inorganic sludge pretreatment process Inorganic sludge main treatment process, which adds a flocculant to sludge treated in, and agglomerates and separates inorganic substances contained in the sludge.
A method for treating organic sludge and inorganic sludge, comprising a post-treatment step of biological treatment and membrane treatment of the sludge treated in the organic sludge main treatment step and the inorganic sludge main treatment step.   The organic sludge treatment method according to claim 1, further comprising a step of thermally decomposing the organic matter coagulated and separated in the organic sludge main treatment step.   The organic sludge and inorganic sludge treatment method according to claim 3, further comprising a step of thermally decomposing the organic matter coagulated and separated in the organic sludge main treatment step.

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